import { invariant, millisecondsToSeconds, secondsToMilliseconds, noop } from 'motion-utils';
import { style } from '../render/dom/style.mjs';
import { getFinalKeyframe } from './keyframes/get-final.mjs';
import { hydrateKeyframes } from './keyframes/hydrate.mjs';
import { startWaapiAnimation } from './waapi/start-waapi-animation.mjs';
import { applyGeneratorOptions } from './waapi/utils/apply-generator.mjs';

const animationMaps = new WeakMap();
const animationMapKey = (name, pseudoElement) => `${name}:${pseudoElement}`;
function getAnimationMap(element) {
    const map = animationMaps.get(element) || new Map();
    animationMaps.set(element, map);
    return map;
}
/**
 * NativeAnimation implements AnimationPlaybackControls for the browser's Web Animations API.
 */
class NativeAnimation {
    constructor(options) {
        /**
         * If we already have an animation, we don't need to instantiate one
         * and can just use this as a controls interface.
         */
        if ("animation" in options) {
            this.animation = options.animation;
            return;
        }
        const { element, name, keyframes: unresolvedKeyframes, pseudoElement, allowFlatten = false, } = options;
        let { transition } = options;
        this.isPseudoElement = Boolean(pseudoElement);
        this.allowFlatten = allowFlatten;
        /**
         * Stop any existing animations on the element before reading existing keyframes.
         *
         * TODO: Check for VisualElement before using animation state. This is a fallback
         * for mini animate(). Do this when implementing NativeAnimationExtended.
         */
        const animationMap = getAnimationMap(element);
        const key = animationMapKey(name, pseudoElement || "");
        const currentAnimation = animationMap.get(key);
        currentAnimation && currentAnimation.stop();
        /**
         * TODO: If these keyframes aren't correctly hydrated then we want to throw
         * run an instant animation.
         */
        const keyframes = hydrateKeyframes(element, name, unresolvedKeyframes, pseudoElement);
        invariant(typeof transition.type !== "string", `animateMini doesn't support "type" as a string. Did you mean to import { spring } from "motion"?`);
        transition = applyGeneratorOptions(transition);
        this.animation = startWaapiAnimation(element, name, keyframes, transition, pseudoElement);
        if (transition.autoplay === false) {
            this.animation.pause();
        }
        this.removeAnimation = () => animationMap.delete(key);
        this.animation.onfinish = () => {
            if (!pseudoElement) {
                style.set(element, name, getFinalKeyframe(keyframes, transition));
                this.cancel();
            }
        };
        /**
         * TODO: Check for VisualElement before using animation state.
         */
        animationMap.set(key, this);
    }
    play() {
        this.animation.play();
    }
    pause() {
        this.animation.pause();
    }
    complete() {
        this.animation.finish();
    }
    cancel() {
        try {
            this.animation.cancel();
        }
        catch (e) { }
        this.removeAnimation();
    }
    stop() {
        const { state } = this;
        if (state === "idle" || state === "finished") {
            return;
        }
        this.commitStyles();
        this.cancel();
    }
    /**
     * WAAPI doesn't natively have any interruption capabilities.
     *
     * In this method, we commit styles back to the DOM before cancelling
     * the animation.
     *
     * This is designed to be overridden by NativeAnimationExtended, which
     * will create a renderless JS animation and sample it twice to calculate
     * its current value, "previous" value, and therefore allow
     * Motion to also correctly calculate velocity for any subsequent animation
     * while deferring the commit until the next animation frame.
     */
    commitStyles() {
        if (!this.isPseudoElement) {
            this.animation.commitStyles?.();
        }
    }
    get duration() {
        const duration = this.animation.effect?.getComputedTiming().duration || 0;
        return millisecondsToSeconds(Number(duration));
    }
    get time() {
        return millisecondsToSeconds(Number(this.animation.currentTime) || 0);
    }
    set time(newTime) {
        this.animation.currentTime = secondsToMilliseconds(newTime);
    }
    /**
     * The playback speed of the animation.
     * 1 = normal speed, 2 = double speed, 0.5 = half speed.
     */
    get speed() {
        return this.animation.playbackRate;
    }
    set speed(newSpeed) {
        this.animation.playbackRate = newSpeed;
    }
    get state() {
        return this.animation.playState;
    }
    get startTime() {
        return Number(this.animation.startTime);
    }
    get finished() {
        return this.animation.finished;
    }
    flatten() {
        if (this.allowFlatten) {
            this.animation.effect?.updateTiming({ easing: "linear" });
        }
    }
    /**
     * Attaches a timeline to the animation, for instance the `ScrollTimeline`.
     */
    attachTimeline(timeline) {
        this.animation.timeline = timeline;
        this.animation.onfinish = null;
        return noop;
    }
    /**
     * Allows the animation to be awaited.
     *
     * @deprecated Use `finished` instead.
     */
    then(onResolve, onReject) {
        return this.finished.then(onResolve).catch(onReject);
    }
}

export { NativeAnimation };